Hydrocarbon-burner.



W. SGRIMGEOUR. HYDBOGARBON BURNER. APPLIcATIoN FILED JAN. 1o

Patented Feb. 16, 1915.

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W. SGRIMGEOUR. HYDROOARBON BURNER. ABPLIOATLON FILED JANJO, 1908.

Patented Feb. 16, 1915.

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HE NQRRIS PETERS CO PHOTQLITHO.. WASH/NGIUN. D 05' lflldlflf@ @TATE PATENT @Flfllfm WILLIAIVISCB/IMQEOUR, yOF PQRTSM'OUTH, VIRGINIA, ASSIGNOR TO- MIRCS FUEL-OIL EQUIPMENTiCOMPANY, OE NORFOLK, VIRGINIA.

HYDROCARBON-B'URNER.

lSpecification of Letters Patent.

lljatfentcdlleb. 1li., 1915..

To all whom it may concern:

Be it known that l, WILLIAM ScnrMGEoUR, a citizen of the United States, residing at Portsmouth, in the county of Norfolk and State of Virginia, have invented certain new and useful improvements in Hydrocarbon- Burners, of which the following is a especication.

rlhe object of this invention is the .provision in connection with a burner for hydrocarbon or other fuels of a hood or casing adapted to direct, control and modify the flame. The hood is particularly adapted for use with portable burners, and for such use it is desirable that it should be of light construction. It is found in practice that the hood constructed substantially as hereinafter described, even when consisting of com paratively light sheet-metal, adds greatly to the effectiveness of the burner for certain uses, permits it to be employed in open air, and is not subject to injury by a ame capable of producing a welding temperature.

A preferred embodiment of the invention is shown in the accompanying drawings, wherein- Figure 1 is a central horizontal section through a preferred form of hood, the burner and connections thereto being shown in plan; Fig. 2 is a rear view of the form of hood shown in Fig. 1; Fig. 3 is a central longitudinal section of a modified form of hood; Fig. 4 is a rear view of a further modification; and Fig. '5 is a perspective view of a modified construction yof the inner shell.

Referring to the drawings, 1 represents a hydrocarbon burner which may be of any desired type but is shown as of the construction claimed in my Patent No. 928,886, granted July 20, 1909.' rlhe burner 1 is screw-threaded as indicated at 2 for attachment to the rear plate or casting 3 of the hood. The rear plate 3 is provided with inner and outer concentric flanges 4 and 5 extending rearwardly therefrom, the former being` internally threaded for the reception of the burner, and the latter serving for the attachment of the outer shell 6 of the hood. Between the flanges 4 and 5 is an annular recess 7, the rib being perforated as indicated at 8 Jfor the admission of air to the interior of the hood. The shell 6 may take the form of the frustum of an elongated cone as shown in Fig. 1,

converging forwardly from the burner, or it may be modified as indicated in Fig. 3, the portion of the youter shell adj acent the burner being cylindrical or nearly so and the outer or forward portion converging in frustoeconical form. It is essential however that the outer shell should converge toward the flame.

Concentrically disposed within the shell 6 and secured to the rear plate 3 by any suitable means is a frusto-conical inner shell 9, converging like the outer shell toward the flame. In the preferred construction the convergence of the inner shell is somewhat greater than that of the outer as clearly shown in Figs. 1 and 3, whereby the crosssectional area of the intermediate annular air-conduit 10 is regularly increased to compensate for the expansion of the air due to its progressive rise in temperature.

In the construction illustrated in Figs. 1, 2, 3, the perforations 8 in the rear plate are so disposed as to communicate solely with the annular passage 10 between the inner and outer shells. In certain cases however it is found desirable to provide a limited air-supply to the inner shell, and for this purpose the rear plate may be modified as indicated in Fig. 4 by the provision of aper tures 11 surrounding the burner. fn either construction of the rear plate the outer perforations may be merged into comparatively large open areas for the admission of air as indicated at 8a in Fig. 4.

A further modification of the inner cone or shell is shown in Fig. 5, wherein the same is illustrated as provided with a comparatively small number of peripheral perforations 122L for the admission of a limited amount of air.

In use the burner is provided with the usual connections for the supply of fuel, usually but not necessarily a hydrocarbon oil, and air, steam or other fluid medium for the combustion. As shown in Fig. 1, I may provide an oil pipe 1Q, having a valve 13, and a steam or air pipe 14 having a valve 15, the pipes 12 and 14 extending rearwardly and united by a yoke 16, beyond which they are connected by flexible conduits 17 to suitable sources of supply.

In operation of the burner the flame may be projected many feet in advance of the hood without injury thereto: this is due to the conformation of parts whereby the inner shell prevents the outward flaring of the flame within the hood, while both inner and outer shells are adequately cooled by the current of air drawn through the annular conduit 10. The outer shell 6, in conjunction with the air inlets thereto, performs several functions, in that it directs the air against the outer walls of the inner shell and prevents injury thereof; it directs this air to the point of most intense combustion in advance of its orifice; and it gives direction to the flame while itself protected by the mantel of air moving forwardly along its inner walls.

In order to prevent such cooling effect upon the inner cone as might interfere with the completeness of the combustion o-r with the regular operation of the burner it is at times desirable to admit air to the interior of this cone. Such admission may be through the rear apertures 1l (F ig. 4) or through apertures 12a intermediate the ends of the cone (Fig. 5).

By the term pressure fluid used in the claims is'meant either air or steam pressure fluid.

I claim;

1. In combination, a burner, means for supplying thereto fuel and pressure fluid, a hood surrounding said burner, said hood comprising two concentric shells having op'en outer ends each converging in the direction of the flame and providing an intermediate air space, said inner hood being imperforate at the portion immediately surrounding the burner, and air inlets communicating with said air-space.

2. In combination, a burner, means for supplying thereto fuel and pressure fluid and a hood surrounding said burner, said hood comprising two concentric shells having open outer ends and each converging in the direction of the llame, the inner shell converging more rapidly than the outer, thereby providing an intermediate space of progressively increasing cross-sectional area, and air-inlets communicating with said airspace.

3. A burner hood comprising two concentric shells each converging in the direction of the flame and providing an intermediate air-space, a common support for said shells having an aperture for receiving the burner, and air-inlets in said support communicating with said air-space.

4;. A burner hood comprising two concentric shells each converging in the direction of the flame and providing an intermediate air-space, a common support for said shells having an aperture for receiving the burner, air-inlets in said support communicating with said air-space, and supplemental airinlets communicating with the interior of the inner shell.

5. In combination, a cylindrical burner having external screw-threads and means for supplying thereto fuel and pressure fluid, a plate having a central thereaded aperture engaging said burner, two concentric shells supported by said plate, said shells converging in the direction of the flame and providing an intermediate air-space, and air-inlets communicating with said airspace, the inner shell having a closed inner end portion.

6. In combination, a burner, means for supplying fuel and pressure fluid thereto, a hood surrounding said burner, said hood comprising two conecentric shells each converging in the direction of the flame and providing an intermediate air-space, and air-inlets communicating with said air-space, said inner shell apertured intermediate its ends, the inner shell having a closed inner end portion.

7. A burner hood comprising a plate centrally perforated to receive a burner, a frusto-conical inwardly converging open-ended sheet-metal shell secured at its base to the plate, a second frusto-conical sheet-metal shell coaxial with and within the first, also secured to the base, the base plate having air-inlets communicating with the space between the shells.

In testimony whereof, I aflix my signature in presence of two witnesses.

WILLIAM SCRIMGEOUR.

Witnesses:

C. P. TowNsEND, N. P. LEONARD.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

